Fix usage error

gofile.io-dl

@@ -24,7 +24,7 @@ function printurl {
 
 if [[ $# -ne 1 || ( ! "$1" =~ ^https://gofile\.io/d/[0-9a-zA-Z]+$ && ! "$1" =~ ^https://gofile\.io/\?c=[0-9a-zA-Z]+$ ) ]]
 then
-	echo 'Usage: gofile.io-dl URL' >&2
+	echo 'Usage: gofile.io-dl [--urls] [--nodl] URL' >&2
 	exit 1
 fi